arch/m32r/kernel/process.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  linux/arch/m32r/kernel/process.c
   4  *
   5  *  Copyright (c) 2001, 2002  Hiroyuki Kondo, Hirokazu Takata,
   6  *                            Hitoshi Yamamoto
   7  *  Taken from sh version.
   8  *    Copyright (C) 1995  Linus Torvalds
   9  *    SuperH version:  Copyright (C) 1999, 2000  Niibe Yutaka & Kaz Kojima
  10  */
  11
  12 #undef DEBUG_PROCESS
  13 #ifdef DEBUG_PROCESS
  14 #define DPRINTK(fmt, args...)  printk("%s:%d:%s: " fmt, __FILE__, __LINE__, \
  15   __func__, ##args)
  16 #else
  17 #define DPRINTK(fmt, args...)
  18 #endif
  19
  20 /*
  21  * This file handles the architecture-dependent parts of process handling..
  22  */
  23
  24 #include <linux/fs.h>
  25 #include <linux/slab.h>
  26 #include <linux/sched/debug.h>
  27 #include <linux/sched/task.h>
  28 #include <linux/sched/task_stack.h>
  29 #include <linux/module.h>
  30 #include <linux/ptrace.h>
  31 #include <linux/unistd.h>
  32 #include <linux/hardirq.h>
  33 #include <linux/rcupdate.h>
  34
  35 #include <asm/io.h>
  36 #include <linux/uaccess.h>
  37 #include <asm/mmu_context.h>
  38 #include <asm/elf.h>
  39 #include <asm/m32r.h>
  40
  41 #include <linux/err.h>
  42
  43 void (*pm_power_off)(void) = NULL;
  44 EXPORT_SYMBOL(pm_power_off);
  45
  46 void machine_restart(char *__unused)
  47 {
  48 #if defined(CONFIG_PLAT_MAPPI3)
  49         outw(1, (unsigned long)PLD_REBOOT);
  50 #endif
  51
  52         printk("Please push reset button!\n");
  53         while (1)
  54                 cpu_relax();
  55 }
  56
  57 void machine_halt(void)
  58 {
  59         printk("Please push reset button!\n");
  60         while (1)
  61                 cpu_relax();
  62 }
  63
  64 void machine_power_off(void)
  65 {
  66         /* M32R_FIXME */
  67 }
  68
  69 void show_regs(struct pt_regs * regs)
  70 {
  71         printk("\n");
  72         show_regs_print_info(KERN_DEFAULT);
  73
  74         printk("BPC[%08lx]:PSW[%08lx]:LR [%08lx]:FP [%08lx]\n", \
  75           regs->bpc, regs->psw, regs->lr, regs->fp);
  76         printk("BBPC[%08lx]:BBPSW[%08lx]:SPU[%08lx]:SPI[%08lx]\n", \
  77           regs->bbpc, regs->bbpsw, regs->spu, regs->spi);
  78         printk("R0 [%08lx]:R1 [%08lx]:R2 [%08lx]:R3 [%08lx]\n", \
  79           regs->r0, regs->r1, regs->r2, regs->r3);
  80         printk("R4 [%08lx]:R5 [%08lx]:R6 [%08lx]:R7 [%08lx]\n", \
  81           regs->r4, regs->r5, regs->r6, regs->r7);
  82         printk("R8 [%08lx]:R9 [%08lx]:R10[%08lx]:R11[%08lx]\n", \
  83           regs->r8, regs->r9, regs->r10, regs->r11);
  84         printk("R12[%08lx]\n", \
  85           regs->r12);
  86
  87 #if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
  88         printk("ACC0H[%08lx]:ACC0L[%08lx]\n", \
  89           regs->acc0h, regs->acc0l);
  90         printk("ACC1H[%08lx]:ACC1L[%08lx]\n", \
  91           regs->acc1h, regs->acc1l);
  92 #elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
  93         printk("ACCH[%08lx]:ACCL[%08lx]\n", \
  94           regs->acc0h, regs->acc0l);
  95 #else
  96 #error unknown isa configuration
  97 #endif
  98 }
  99
 100 void flush_thread(void)
 101 {
 102         DPRINTK("pid = %d\n", current->pid);
 103         memset(&current->thread.debug_trap, 0, sizeof(struct debug_trap));
 104 }
 105
 106 void release_thread(struct task_struct *dead_task)
 107 {
 108         /* do nothing */
 109         DPRINTK("pid = %d\n", dead_task->pid);
 110 }
 111
 112 /* Fill in the fpu structure for a core dump.. */
 113 int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
 114 {
 115         return 0; /* Task didn't use the fpu at all. */
 116 }
 117
 118 int copy_thread(unsigned long clone_flags, unsigned long spu,
 119         unsigned long arg, struct task_struct *tsk)
 120 {
 121         struct pt_regs *childregs = task_pt_regs(tsk);
 122         extern void ret_from_fork(void);
 123         extern void ret_from_kernel_thread(void);
 124
 125         if (unlikely(tsk->flags & PF_KTHREAD)) {
 126                 memset(childregs, 0, sizeof(struct pt_regs));
 127                 childregs->psw = M32R_PSW_BIE;
 128                 childregs->r1 = spu;    /* fn */
 129                 childregs->r0 = arg;
 130                 tsk->thread.lr = (unsigned long)ret_from_kernel_thread;
 131         } else {
 132                 /* Copy registers */
 133                 *childregs = *current_pt_regs();
 134                 if (spu)
 135                         childregs->spu = spu;
 136                 childregs->r0 = 0;      /* Child gets zero as return value */
 137                 tsk->thread.lr = (unsigned long)ret_from_fork;
 138         }
 139         tsk->thread.sp = (unsigned long)childregs;
 140
 141         return 0;
 142 }
 143
 144 /*
 145  * These bracket the sleeping functions..
 146  */
 147 #define first_sched     ((unsigned long) scheduling_functions_start_here)
 148 #define last_sched      ((unsigned long) scheduling_functions_end_here)
 149
 150 unsigned long get_wchan(struct task_struct *p)
 151 {
 152         /* M32R_FIXME */
 153         return (0);
 154 }